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Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment gross |
$ 34,214 |
$ 19,122 |
| Less accumulated depreciation |
6,654 |
2,941 |
| Premises and equipment net |
27,560 |
16,181 |
| Land [Member] |
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| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment gross |
11,389 |
3,205 |
| Building and Improvements [Member] |
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|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment gross |
12,525 |
6,500 |
| Furniture and Equipment [Member] |
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|
| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment gross |
5,854 |
2,904 |
| Leasehold Improvements [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
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|
| Premises and equipment gross |
3,045 |
2,377 |
| Construction in Process [Member] |
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| Property, Plant and Equipment [Line Items] |
|
|
| Premises and equipment gross |
1,348 |
4,136 |
| Automobile [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment gross |
$ 53 |
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